Clone GraphicsOverlay

Question

Hi,

I have a map and an overview map, and I'd like to have same graphics on both maps, but when trying to assign a GraphicsOverlay to the GraphicOverlays of both maps, it returns an exception that object is already owned, because both maps have same graphics.

How can this be done? Can I clone or copy graphics o GraphicOverlays?

Regards

Gonzalo

ThadTilton · Answer

I think you'll have to copy each graphic and add it to the other graphics overlay. Here's how I did it: private void CopyGraphicsButton_Click(object sender, RoutedEventArgs e) { GraphicsOverlay go1 = MapView1.GraphicsOverlays.FirstOrDefault(); GraphicsOverlay go2 = MapView2.GraphicsOverlays.FirstOrDefault(); foreach(Graphic g in go1.Graphics) { Graphic newGraphic = CopyGraphic(g); go2.Graphics.Add(newGraphic); } } private Graphic CopyGraphic(Graphic inGraphic) { Graphic copyGraphic = new Graphic(inGraphic.Geometry, inGraphic.Attributes, inGraphic.Symbol); return copyGraphic; }‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ I hope that helps! Thad

GonzaloMuöoz · Answer

Your approach ends into the same result:

Esri.ArcGISRuntime.ArcGISRuntimeException: 'Object already owned.: Graphic cannot be added - it is already in an owning collection.'

JoeHershman · Answer

MapView:GraphicsOverlays is a GraphicsOverlayCollection which has a CopyTo method. This would be similiar to a Clone. You create a new array and then copy into that array and then you can assign the new GraphicsOverlayCollection to the overview MapView LayerCollection operationalLayers = new LayerCollection(); Layer[] tempLayers = new Layer[map.OperationalLayers.Count]; map.OperationalLayers.CopyTo(tempLayers, 0); foreach (var operationalLayer in tempLayers) { map.OperationalLayers.Remove(operationalLayer); operationalLayers.Add(operationalLayer); }‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ The above is done to replace the OperationalLayers in a map, but the general idea is the same, just using GraphicOverlays. Instead of the .Remove, .Add like above use the temp array and add them to you other MapView